<?php echo '<?'; ?>xml version="1.0" encoding="<?php echo $this->charset; ?>" standalone="yes" ?>
<!DOCTYPE form [
  <!ELEMENT form (field)+>
  <!ELEMENT field (name, value+)>
  <!ELEMENT name (#PCDATA)>
  <!ELEMENT value (#PCDATA)>
]>
<form>
  <?php foreach ($this->fields as $field): ?>
    <field>
      <name><?php echo $field['name']; ?></name>
      <?php foreach ($field['values'] as $value): ?>
        <value><?php echo $value; ?></value>
      <?php endforeach; ?>
    </field>
  <?php endforeach; ?>
</form>